Winding machine for the manufacture of insulating tubes, hollow insulating cylinders, and the like



March 189 1924 1 1,487,059 E. HAEFELY WINDING MACHINE FOR THE MANUFACTURE OF INSULATING TUBES,

HOLLOW INSULATING CYLINDERS, AND THE LIKE Filed Oct. 25 1919 F. II; D

Patented Mar. 18, 1924.

UNITED STATES v 1,487,059 PAT NT oFF cE.

mm. IBAEFELY, or BAsEL, SWITZERLAND. I I

WINDING MACHINE FOR THE MANUFACTURE or INsULATINe'rUBEs, HoLDowj INSULATING CYLINDERS, AND THE L KE Application filed October 25, 1919. Serial No. 333,343.

To all whom it may concern;

Be it known that I, EMIL..HAEFELY, a citizen of the Swiss Republic,-and resident of Basel, Switzerland, have invented new and useful Improvements in W'inding Ma-- duringthe process of winding the fibrousmaterial from which it is constructed, it is necessary that the direction of pressure at the contact points of the Wound material with the heating cylinders should remain constant in order that the band of fibrous material between the heating cylinders for smaller or larger diameters of the wound product may subtend the same angle and thereby effect an evenly stretched and smooth winding of the band of fibrous material.

According to the present invention this is achieved by causing the-freely rotatable heating cylinders during the process of winding to be gradually moved apart from one another by means of an adjusting device, so that the angle between the directions of pressure at the contact points of the winding material with the heating cylinders remains constantly approximately the same. The radial components of the pressure at the said contactpoints will thus experience no appreciable alteration and consequently by reason of this even pressure the wound product from the con'nnencement to the conclusion of the winding process is perfectly homogeneous.

In machines of considerable width, in which the heating cylinders are relatively long and of relatively small diameter, and are provided with supporting shafts for the prevention of bending, these supporting shafts are preferably located in common hearing slides with the heating cylinders in such a manner that the supporting shafts take part in the outward movement of the heating cylinders away from one another. The accompanying drawings illustrate; a constructional form of machine embodying the invention. r

Fig. 1 is a. view in end elevation of the machine adapted for the formation of'insn'l'ating tubes on a winding mandrel.

Fig. 2 is a similar view of the same mw chine when a larger mandrel is employed as the winding former.

Fig. 3 is a plan View machine shown in Fig. 1. g Fig. 4 is a vertical section on the line AB ofFig. 1.

The two heating cylinders a, 'b are mountf ed so as to be freely'rotatable in sliding from above of the bearingsc carried by the side portions 8' of.

the frame of the machine. Their displacement is effected by means oftwo rotatable screw-threaded spindles at having right and left threads, so that by rotating the spindles' d the heating cylinders'a, b can be moved ttfivards or away from one another.

For the purpose of rotating thespindles (Z-' .a bevel gearing e and a' h'andle'f are'provided. Alternatively the rotation of the screw-threaded spindlescan be arranged to be effected by means of an auton'lat-iczfeed device, dependent for example upon the operation of the winding action.

The band of fibrous'material, for instance a band of paper r whichis coated or impregnated with an agglutinant, is drawnin on to a rotatable winding mandrel la, freely supported, above and between the heating cylinders a, b. The mandrel h isdriven from any desired source of power by means of a flexible coupling or aamiversal joint for example, allowing of vertical displacementof the mandrel within the limits of variation of the diameter of, the paper roll. Vertically above the mandrel hand midway bethe axes of the heating cylinders is a small pressure cylinder i and a heavy pressure.

fact that under 'the heating action of the cylinders a, b the agglutinant becomes liquetween the vertical planes passing through fied, the successive layers of the hand of fibrous material are pressed together closely and compactly together in a known manner in order to form a firm tubular struc- .ture. The component pressures at the corn tact points of the winding material with the heating cylinders a, b are so adjusted that their directions of pressure are inclined to each other at an angle of 90, and both pass through the axis of the winding mandrel. This angle, due to the possibility of moving the two heating cylinders apart, can be maintained constant at all stages of the Winding process, as will be seen from a comparison of Figs. 1 and 2, in spite of the fact that as the diameter of the wound product increases the axis of the winding mandrel is raised. The radial components of the pressures at the contact points of the winding material with the heating cylinders therefore remain constant in magnitude and direction, so that the drawing-in of the band of fibrous material between the heating cylinders for smaller or larger diameters of the wound product is efiected over the same angle formed by the component pressure directions. Hence with a constant effective pres sure a perfectly smooth and evenly tensioned application of the band of fibrous material is effected as is necessary for insulating purposes of an electro-technical nature.

According to the drawing, the heating cylinders a, b with small diameter are comparatively long (see Fig. 3) and are liable to bend under the considerable pressure to which they are subjected unless special precautions are taken. In order to prevent such bending of the heating cylinders, two supporting shafts m, n, of larger diameter in the middle than at either end, are provided which support the heating cylinders a, b at a middle point. These supporting shafts m, n are supported in the same slidingbearings 0 as the respective heating cylinders a, I) (see Fig. 4) so that they partake of the outward movement of the heating cylinders.

It will be understood that the initial position of the heating cylinders a, b is determined in accordance with the size of the winding mandrel to be employed. In Fig. 1

the heating cylinders for use with a winding mandrel of small diameter are first set very close together; in Fig. 2 they are shown as set to a greater distance apart for use with a larger size of winding mandrel. The movement apart of the heating cylinders however from their initial position must ,two freely rotatable and horizontally adjustable heating cylinders, bearin'g slides for supporting and guiding the same in hori- .zontal-direct-ion, a freely supported driven rotary winding mandrel between the said heating cylinders capable of free elevation to wind the band upon it and to frictionally rotate said heating cylinders, a freely rotating heavy pressure cylinder, a freely rotating smaller intermediate pressure cylinder arranged to transmit the pressure of said heavy cylinder onto the winding mandrel, and positively acting common adjusting means connected with said bearing slides to move gradually and simultaneously the heating cylinders apart from each other during the winding operation, substantially as and for the purpose described.

2. A winding machine for the manufacture of insulating tubes, insulating hollow cylinders and the like for electro-technical purposes from a band of fibrous material supplied with an agglutinant, comprising two freely rotatable and horizontally adjustable heating cylinders of relatively small diameter, bearing slides for supporting and guiding the same in horizontal direction, a freely supported driven rotary winding mandrel between the said heating cylinders to wind the band upon it and to frictionally rotate said heating cylinders, a freely rotatable pressure cylinder arranged to exert thereon the necessary pressure for the winding operation and to be frictionally rotated by the Winding mandrel, shafts arranged be low the heating cylinders to support the same and to thus prevent their bending, and positively acting common adjusting means connected with said bearing slides for gradually and simultaneously moving apart the heating cylinders from each other during the winding operation, substantially as and for the purpose described.

In witness whereof I have hereunto signed my name this 30th day of September, 1919, in the presence of two subscribing witnesses.

EMIL HAEFELY.

Witnesses:

H. H. DICK, AMAND BRAUN. 

